The measurements for oxalic acid syrup are 35 grams per liter. For us non-scientists, the equivalent is 3 Tablespoons per quart. That's quite a lot of syrup, so I mix 4 1/2 teaspoons with a pint of syrup. Mix with 1:1 syrup that's less than 85 degrees F. Shake well to dissolve the crystals. The oxalic acid breaks down quickly so discard any left over. Use 99% pure, or better, OA crystals. Savogran brand 'wood bleach' is one, and is available at True Value.
The OA syrup can be used as a spray or dribble. Either way, do not soak the bees, and make sure they're in at least a 60F environment. I sprayed my package bees when clustered, then shook them down to spray inside the cluster. If you do this method, wait two hours after a syrup spray feeding to treat, so their stomachs are full with plain syrup. Gerard
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March 2019
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